This system can be utilised virtually anywhere to extract stale air and then recover the heating or cooling energy to either warm or cool incoming fresh air. It simultaneously extracts stale air from the internal environment whilst recovering valuable heat energy to maximise efficiency and minimise energy use. The new "Hyper Lossnay Core" at only 25um (approx 1/5 the thickness of LGH-RX5) uses the thinnest paper in the world to achieve high enthalpy exchange efficiency. The Lossnay core is made from a water resistant paper core and sits at the heart of the system. Constructed in a corrugated form and layered in alternate directions, the core allows a cross airflow to maximise heat recovery without the supply and exhaust air mixing, ensuring only fresh air is introduced into the home. Includes free cooling option is the outside ambient air is cooler than the internal air.